linux-kernel - Re: [PATCH 1/5] xen-pcifront: Update warning comment to use 'e820

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Date:	Wed, 24 Aug 2011 15:41:33 -0700
From:	Joe Perches <joe@...ches.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	JBeulich@...ell.com, jeremy@...p.org, ian.campbell@...rix.com,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH 1/5] xen-pcifront: Update warning comment to use
 'e820_host' option.

On Wed, 2011-08-24 at 18:31 -0400, Konrad Rzeszutek Wilk wrote:
> With Xen changeset 23428 "libxl: Add 'e820_host' option to config file"
> the E820 as seen from the host can now be passed into the guest.
> This means that a PV guest can now:
>  - Use the correct PCI I/O gap. Before these patches, Linux guest would
>    boot up and would tell:
>    [    0.000000] Allocating PCI resources starting at 40000000 (gap: 40000000:c0000000)
>    while in actuality the PCI I/O gap should have been:
>    [    0.000000] Allocating PCI resources starting at b0000000 (gap: b0000000:4c000000)
>  - The PV domain with PCI devices was limited to 3GB. It now can be booted
>    with 4GB, 8GB, or whatever number you want. The PCI devices will now _not_ conflict
>    with System RAM. Meaning the drivers can load.
[]
> diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
[]
> @@ -401,8 +401,8 @@ static int pcifront_claim_resource(struct pci_dev *dev, void *data)
>  				pci_name(dev), i);
>  			if (pci_claim_resource(dev, i)) {
>  				dev_err(&pdev->xdev->dev, "Could not claim "
> -					"resource %s/%d! Device offline. Try "
> -					"giving less than 4GB to domain.\n",
> +					"resource %s/%d! Device offline. Try"
> +					"using e820_host=1 in the guest config.\n",

Trivia: You lost the space after "Try".

It's generally better not to split format strings into
multiple pieces.

Perhaps:
 				dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! Device offline. Try using e820_host=1 in the guest config.\n",

or
 				dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! "
					"Device offline. Try using e820_host=1 in the guest config.\n",


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